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+
+ Let us go on modifying Zbus by including nodes and the elements connected to it one by
+ one as given in the textbook
+
+step-1 type1 modification
+Zbus=
+ 0.25
+
+step-2 type2 modification
+Zbus=
+ 0.25 0.25
+ 0.25 0.35
+
+step-3 type2 modification
+Zbus=
+ 0.25 0.25 0.25
+ 0.25 0.35 0.25
+ 0.25 0.25 0.35
+
+step-4 type3 modification
+Zbus=
+ 0.1458333 0.1041667 0.1458333
+ 0.1041667 0.1458333 0.1041667
+ 0.1458333 0.1041667 0.2458333
+This is the final Zbus matrix after including all the elements
+
+step-5 type4 modification
+Zbus=
+ 0.1397059 0.1102941 0.125
+ 0.1102941 0.1397059 0.125
+ 0.125 0.125 0.175
+
+ opening a line between 2-3 is equivalent to connecting (-0.1) between bus3 bus2
+Zbus=
+ 0.1458333 0.1041667 0.1458333
+ 0.1041667 0.1458333 0.1041667
+ 0.1458333 0.1041667 0.2458333
+(same as in step 4)
+